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changeset 10535:2a714dabb624

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8020467: Inconsistency between usage.getUsed() and isUsageThresholdExceeded() with CMS Old Gen pool Reviewed-by: mchung, brutisso
author jbachorik
date Wed, 30 Oct 2013 17:54:48 +0100
parents e45b48874ba9
children 281e26d7f325
files test/java/lang/management/MemoryPoolMXBean/ThresholdTest.java
diffstat 1 files changed, 9 insertions(+), 2 deletions(-) [+]
line wrap: on
line diff
--- a/test/java/lang/management/MemoryPoolMXBean/ThresholdTest.java	Wed Oct 30 09:37:12 2013 -0700
+++ b/test/java/lang/management/MemoryPoolMXBean/ThresholdTest.java	Wed Oct 30 17:54:48 2013 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2007, 2013, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -28,7 +28,7 @@
  *          MemoryPoolMXBean.isCollectionThresholdExceeded().
  * @author  Mandy Chung
  *
- * @run main ThresholdTest
+ * @run main/othervm ThresholdTest
  */
 
 import java.lang.management.*;
@@ -36,6 +36,9 @@
 
 public class ThresholdTest {
     public static void main(String args[]) throws Exception {
+        long[] bigObject = new long[1000000];
+
+        System.gc(); // force an initial full-gc
         List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans();
         try {
             for (MemoryPoolMXBean p : pools) {
@@ -82,6 +85,10 @@
         }
 
         p.setUsageThreshold(1);
+        // force a full gc to minimize the likelihood of running GC
+        // between getting the usage and checking the threshold
+        System.gc();
+
         MemoryUsage u = p.getUsage();
         if (u.getUsed() >= 1) {
             if (!p.isUsageThresholdExceeded()) {